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Description
The TM020-mode cavity offers a high quality factor, a large shunt impedance, and effective higher order modes (HOMs) damping, while maintaining a compact longitudinal structure. However, in single-input cavities, the coupling iris experiences excessive thermal loading as the input power increases, and insufficient cooling eventually degrades cavity performance. To address this issue, we developed a two-input cavity design that reduces the power handled by each input coupler while preserving the total input power. This configuration improves field symmetry and suppresses leakage of the operating mode. The optimized two-input cavity operates at 499.7 MHz, achieves a quality factor of 60,000, provides a shunt impedance above 5 MΩ, and maintains a leakage rate below 1%.
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